In the late 19th and early 20th centuries, physical models were widely used by mathematics educators to depict a wide range of mathematical ideas in three dimensions. Most models were constructed in ...

Natural physical networks are continuous, three-dimensional objects, like the small mathematical model displayed here.

One use of mathematical models of epidemics is thought experiments to aid scientists in reasoning from premise to conclusion in complex systems. Quite a few models of the Covid-19 pandemic have now ...